Microsoft XBOX CONTROLLER Repair Instructions page 57

Procedure – Removal (I/O Board)
1. Remove Screws
Using a T6 (Torx) driver remove the 4 screws securing the I/O board to the mid-frame.
2. Remove I/O Board
Lift the I/O board out of the mid-frame.
Procedure – Installation (I/O Board)
1. Insert I/O Board
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